JP3754907B2 - A wireless communication system having a transparent mode RLC layer and a data processing method in the wireless communication system. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radio communication system having a transparent mode RLC layer and a data processing method in the radio communication system.
[0002]
[Prior art]
Recently in view of the reality that research and many contrivances for obtaining a visible result of the study of the communication technologies that allow the approach without spatial constraints when multimedia have been made, the development of transmission technology and digital data processing Is nearing the realization of a real-time global data communication system using satellites by integrating wired and wireless communications.
[0003]
In addition, with the development of digital data processing and transmission technology, it is possible to freely access information anywhere at any time, regardless of whether it is a voice call of related technology or real-time transmission of network-based stop images and moving images and wired or wireless. It is possible.
[0004]
That is, IMT-2000 is one of them.
[0005]
The radio link control layer (RLC: Radio Link Control) shown in the present invention corresponds to the second layer of 3GPP, the protocol layer for controlling the data link corresponds to the second layer of the OSI 7 layer model, and is currently used in 3GPP. There are two types of (ENTITY): Tr mode (Transparent Mode: hereinafter referred to as “Tr mode”) without an RLC header and NTr mode (Non-Transparent Mode: hereinafter referred to as “NTr mode”) with a header. Divide by one.
[0006]
Here, the NTr mode is a UM mode (ACK: Acknowledged: hereinafter referred to as “ACK”) signal from the receiving side, and there is a recognition signal from the receiving side. It is divided into AM mode (Acknowledged Mode: hereinafter referred to as “AM mode”). Accordingly, three types of RLC modes currently used are Tr, UM, and AM.
[0007]
FIG. 1 is a diaphragm showing a data transmission apparatus of a radio communication system having a radio link control layer in a transparent mode.
[0008]
Since the Tr mode does not have an RLC header, it is much simpler than the entity structure in the NTr mode.
[0009]
Referring to FIG. 1, based on the radio interface 100, a data transmission apparatus having the transparent mode RLC layer 101 generates a service data unit from the upper layer into a protocol data unit having a constant size. Segmentation via
[0010]
The protocol data units thus segmented are stored in the transmission buffer 103 and then sent to the MAC 104 layer via a logical channel.
[0011]
When the RLC layer 101 in the transparent mode transmits the PDU to the MAC layer 104 in the data transmission apparatus, the PDU is transmitted at a set transmission time interval.
[0012]
The RLC 101 transmits the required number of PDUs from the MAC layer 104. For this purpose, the MAC layer 104 notifies the RLC layer 101 of information on the number of PDUs desired for each TTI through its state information.
[0013]
As described above, the RLC layer 101 determines that the MAC among the PDUs stored in the transmission buffer 103 according to information on the number of PDUs that the MAC layer 104 is to receive from the MAC layer 104 for each TTI. The PDU corresponding to the number requested by the layer 104 is transmitted to the MAC layer 104.
[0014]
The PDU is transmitted based on the radio interface 100 to the data receiving apparatus 105 of the wireless communication system having the transparent mode RLC layer.
[0015]
The receiving device 105 stores the PDU received based on the radio interface 100 for a certain period of time in the reception buffer 106 and then sends it to the upper layer in units of SDU every time all the PDUs constituting one complete SDU are received. It is done. That is, the protocol data unit is reassembled in the SDU unit by the reassembly 107 and transmitted to the upper layer.
[0016]
The related art has the following problems.
[0017]
First, in the transmission apparatus, the MAC layer 104 multiplexes PDUs from a number of RLC layers and transmits them to a physical layer (PHY) through a transmission channel. At this time, in order to increase transmission efficiency, the MAC layer 104 adjusts the number of PDUs received from each RLC layer for each TTI.
[0018]
However, sufficient improvement in transmission efficiency cannot be expected only by adjusting only the number of PDUs for each TTI.
[0019]
For more efficient transmission, it is desirable to adjust not only the number of PDUs received from each RLC for each TTI but also the PDU size, but the related art structure makes it difficult to adjust the PDU size for each TTI.
[0020]
As shown in FIG. 1, a data transmission apparatus having a transparent mode RLC layer according to the related art already segments the service data unit from the RLC layer 101 into protocol data units of a certain size, and then transmits the protocol data unit to the transmission unit. When a PDU having a PDU size different from the PDU size previously transmitted to the TTI is stored in the buffer 103, the PDU stored in the transmission buffer 103 should be further reconfigured into an SDU.
[0021]
Next, the reconfigured SDU should be further segmented into PDUs having the size requested from the MAC layer 104 and then the re-segmented PDUs should be further transmitted to the MAC layer 104.
[0022]
In the above case, a means or a process for further reconfiguring the PDU stored in the transmission buffer 103 into an SDU is required, and the MAC layer 104 has a size for requesting the reconfigured SDU. A process of segmenting into PDUs is required.
[0023]
That is, the configuration of the RLC layer is complicated, and the transmission processing speed of the protocol data unit is increased.
[0024]
[Problems to be solved by the invention]
An object of the present invention is to solve the above-described problems of the related art, and an object of the present invention is to provide a radio communication system capable of processing by changing not only the number of protocol data units but also the size thereof.
[0025]
It is another object of the present invention to provide a method for processing protocol data units in a wireless communication system.
[0026]
[Means for Solving the Problems]
According to an embodiment of the present invention for achieving the above object, a method for transmitting data in a wireless communication system having a radio link control layer in a transparent mode includes transmission data storing service data units transmitted from an upper layer. A storage module; and a segment module for segmenting the service data unit into at least one protocol data unit having the desired size and number according to a request signal from a lower layer and transmitting the at least one protocol data unit to the lower layer. Is provided.
[0027]
According to another embodiment of the present invention for achieving the above object, a method for transmitting data in a wireless communication system having a radio link control layer in a transparent mode includes transmitting a service data unit received from an upper layer as transmission data. Storing in the module; setting the number and size of protocol data units for the received service data units variably according to a request from a lower layer; the set number of the stored service data units And creating at least one protocol data unit corresponding to the above; and transmitting the at least one protocol data unit to the lower layer.
[0028]
Preferably, the radio link control layer operates in a transparent mode.
[0029]
Preferably, the transmission data storage module processes data in units of service data units. The transmission data storage module stores the service data unit that is not segmented.
[0030]
Preferably, the protocol data units for the radio link control layer can be transmitted to the MAC layer 104 at different transmission time intervals (TTI) with different numbers and sizes of the protocol data units.
[0031]
A wireless communication system having a transparent mode wireless link control layer according to the present invention stores a service data unit transmitted from an upper layer and receives information on a desired size and number of protocol data units from a lower layer. And segmenting the service data unit from at least one protocol data unit having the desired size and number according to information from the lower layer, and transmitting the at least one protocol data unit to the lower layer. It is characterized by providing.
[0032]
The lower layer may be a media access control (MAC) layer.
[0033]
The service data unit enters the transmission data storage module from the upper layer via transparent-SAP, and the at least one protocol data unit is a logical channel, BCCH, PCCH, DCCH, CCCH, DTCH, or SHCCH. It may be further characterized in that it is transmitted toward the receiving side via one of these logical channels.
[0034]
A data processing method in a wireless communication system having a radio link control layer in a transparent mode according to the present invention includes a step of storing service data units transmitted from an upper layer in a transmission data module, and a desired number of protocol data units from the lower layer. And receiving information on the size, creating each service data unit into at least one protocol data unit according to the received information on the number and size, and at least one at each transmission time interval TTI. Transmitting a protocol data unit to the lower layer.
[0035]
Each service data unit may be further segmented to create the desired size and number of protocol data units.
[0036]
No overhead or header is added to the PDU, the segmentation is performed according to what transmission channel transmission format is used, and one specific transmission format is determined by the segmentation on the receiving side. It may be a further feature that information is given on whether or not it has been confirmed.
[0037]
The lower layer may be a MAC layer.
[0038]
The transmission data storage module may further store and output data in units of the service data unit SDU.
[0039]
The number and size of the protocol data units to be transmitted to the reception side via the lower layer may be different from each other in the transmission time interval (TTI).
[0040]
The service data unit enters the transmission data storage module from the upper layer through a transparent SAP, and the at least one protocol data unit is any one of BCCH, PCCH, DCCH, CCCH, DTCH and SHCCH, such as a logical channel. It may be further characterized in that it is transmitted toward the receiving side through one logical channel.
[0041]
When the RLC layer of the wireless communication system is on the user plane, when the logical channel DTCH or the RLC layer is on the control plane, one of DCCH, CCCH, BCCH, SHCCH and PCCH is used for the logical channel. This may be a further feature.
[0042]
Further, one or a plurality of PDUs can be transmitted within each transmission time interval, and for each transmission time interval, the at least one PDU is all segments constituting one SDU. Good.
[0043]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the radio link control layer in the transparent mode will be described in detail with reference to FIG.
[0044]
According to FIG. 2, the RLC of the data transmission device of the wireless communication system has a transparent entity structure. The data transmission apparatus having the transparent entity structure may perform a segmentation step of dividing the service data unit into at least one protocol data unit after storing the service data unit in the transmission data storage module.
[0045]
The MAC in the lower layer of the RLC layer provides not only the number of protocol data units but also information on the size to the RLC layer of the data transmission apparatus. In response to a request from the MAC, the data transmission apparatus segments the service data unit into at least one protocol data unit having a size corresponding to the request, and then transmits the protocol data units to the MAC as many as the number corresponding to the request.
[0046]
In FIG. 2, the data transmission apparatus 201 of the wireless communication system having the wireless communication system layer includes a transmission buffer 202 as a transmission data storage module for storing service data units transmitted from the upper layer, and a lower layer such as the MAC layer 203. A segment module 204 is provided that segments the service data unit into at least one protocol data unit having a desired size and number according to a request signal from the layer and transmits the at least one protocol data unit to the MAC layer 203.
[0047]
Hereinafter, a process of transmitting data by a wireless data transmission apparatus having a transparent mode RLC layer according to the present invention will be described in detail.
[0048]
Referring to FIG. 2, the transparent RLC layer 201 of the wireless data transmission apparatus based on the wireless interface 200 stores the service data unit SDU transmitted from the upper layer through the transparent SAP in the transmission buffer 202.
[0049]
The MAC layer 203 sends information on the number and size of protocol data units (PDUs) that it receives from the transparent mode RLC layer 201 to the transparent mode RLC layer 201 via MAC status notification information.
[0050]
The segment module 204 of the transparent mode RLC layer (or the RLC Tr entity 201) can add an appropriate protocol data unit without adding overhead to the service data unit according to the size of the protocol data unit requested from the MAC layer 203. To segment. The method of performing the segment is determined by the setting time of the service.
[0051]
The RLC SDU can be segmented, and the allowed size for the RLC PDU is determined from the transmission format of the transmission channel. The size of the RLC PDU is determined such that the number of RLC PDUs multiplied by the RLC PDU size becomes the size of the RLC SDU.
[0052]
All RLC PDUs carrying one RLC SDU are sent within one transmission time interval. Further, only one RLC SDU segment is transmitted within one transmission time interval, and other RLC SDU segments are not transmitted.
[0053]
If the segment process is not used for the transparent mode RLC layer, one or more RLC SDUs are sent within the one transmission time interval using one RLC PDU for each RLC SDU. However, the RLC PDUs need to have the same size due to physical layer (PHY) limitations.
[0054]
As described above, the transparent mode RLC layer 201 transmits the protocol data unit to the MAC 203 at a transmission time interval determined when transmitting the protocol data unit.
[0055]
At this time, the protocol data units are transmitted to the MAC 203 in an appropriate number and size according to the amount of the protocol data units requested from the MAC 203.
[0056]
As described above, the MAC 203 transmits the RLC via the information (MAC-STATUS-IND primitive) that informs the state of the number and size of the protocol data units to be transmitted to itself every transmission time interval TTI. Inform layer 201.
[0057]
The RLC layer 201 receives information on the number and size of the protocol data units from the MAC 203 at each transmission time interval TTI from the MAC 203. The RLC layer 201 stores the service data stored in the transmission buffer 202 according to the requested information. After making a unit into at least one protocol data unit having a size required by the MAC 203, the protocol data units are transmitted to the MAC layer 203 as many as the desired number of MACs.
[0058]
The protocol data unit PDU is transmitted to the data receiver 205 having a transparent mode RLC layer based on the radio interface 200.
[0059]
The RLC layer 205 of the data receiving apparatus having the transparent mode RLC layer is one of CCCH, BCCH, DCCH, PCCH, SHCCH, and DTCH among logical channels based on the radio interface 200 from the MAC layer. The protocol data unit received via the is stored in the reception buffer 206.
[0060]
Next, when the RLC layer 205 of the data receiving apparatus receives all the protocol data units PDU constituting one complete service data unit SDU, the data is transmitted in units of the service data unit via the transparent SAP. Sent to higher layer.
[0061]
That is, the protocol data unit unit stored in the reception buffer 206 is further reconfigured by the unit SDU of the RLC service data unit from the reassembly module 207 and then transmitted to the upper layer via the transparent SAP. The reassembly process is performed when the service data unit is segmented into the protocol data unit in the data transmission apparatus.
[0062]
The execution process of the reassembly is determined by the set time of the service.
[0063]
In the present invention, non-segmented SDUs are stored in the transmission buffer 202, and when requesting the protocol data unit from the MAC 203 to the RLC layer 201, not only the number of the PDUs required by itself, Since the PDU size is also notified, it is distinguished from the related art.
[0064]
It should be noted that the transmission buffer 202 processes data units in units of SDUs that are not units of PDUs.
[0065]
Hereinafter, a process of transmitting the transparent mode data will be described with reference to FIG.
[0066]
FIG. 3 is a diagram illustrating a basic process of transmitting transparent mode data between two peer entities (PEER ENTITY) in the transparent mode RLC layer.
[0067]
The transparent mode data transmission process is used to transmit data between two RLC peer entities operating in the transparent mode. In FIG. 3, the transmitter may be a UE (USER ENTITY) or a network, and the receiver may be the network or the UE.
[0068]
The transmitter starts this process when requesting the transparent mode data from the upper layer. When the transmitter is in a data transmission ready state, the transmitter converts the service data unit received from the upper layer or another upper layer into a transparent mode PDU. If necessary, the transmitter converts the SDU from the higher layer into the PDU.
[0069]
The logical channels used are DTCH, CCCH (uplink), SHCCH (uplink), BCCH and PCCH. The logical channel type depends on whether the RLC layer of the transmitter is in the user plane (DTCH) or the control plane (CCCH / BCCH / SHCCH / PCCH).
[0070]
The SDUs that cannot be transmitted within one transmission time interval TTI are buffered according to the discard form set by RRC (not shown). The sizing is applicable when the segment is used.
[0071]
The transparent mode PDU is one complete SDU and may be a segment of one SDU.
[0072]
The execution process of the segment is determined by the set time of the service.
[0073]
No overhead or header is added to the PDU, and instead the segmentation is performed according to what transmission channel transmission format is used. One specific transmission format informs the receiver how to perform the segmentation.
[0074]
When the transparent mode PDU is received, the receiver reassembles the received PDU into the RLC SDU when the SDU is segmented. The RLC layer of the receiver transmits the RLC SDU to the upper layer through the transparent SAP.
[0075]
According to the present invention, a data transmission device of a wireless communication system having an RLC layer in a transparent mode and a method for transmitting data in the data transmission device are provided.
[0076]
The present invention stores service data units transmitted from higher layers and receives information on the number and size of PDUs from the MAC. The service data unit is segmented according to the received information from protocol data units or units of the number and size corresponding to the information in the RLC layer. The protocol data unit or unit is transmitted towards the receiver.
[0077]
【The invention's effect】
As described above, the present invention has the following effects.
[0078]
A data transmission apparatus having a transparent mode RLC layer according to the present invention stores a service data unit transmitted from an upper layer in a transmission buffer, and a desired number of service data units stored variably according to information from a lower layer MAC. And segment by protocol data unit or unit according to size information.
[0079]
Therefore, the protocol data unit can be transmitted efficiently. Furthermore, the present invention can smoothly transmit not only package data having a fixed length but also audio data having a variable length.
[0080]
In addition, the RLC layer of the transmitting device segments the SDU into a desired number and size of PDUs according to information from the MAC, so that the MAC can efficiently multiplex PDUs transmitted from a number of RLC layers. And the performance of data transmission is improved.
[Brief description of the drawings]
FIG. 1 shows a related art RLC Tr entity structure.
FIG. 2 shows an RLC Tr entity structure of the present invention.
FIG. 3 is a diagram illustrating a process of processing transparent mode data between wireless communication systems having a transparent mode RLC layer.
[Explanation of symbols]
100 Interface 101 RLC layer 103 Transmission buffer 104 MAC layer 105 Receiver 106 Reception buffer 107 Reassembly

Claims (17)

A transmission data storage module for storing a service data unit (SDU) transmitted from an upper layer via a transparent SAP (Tr-SAP) ;
The service data units transmitted from the transmission data storage module, based on the size information transmitted with a protocol data unit (PDU) from the lower layer, and a segment module for dividing into at least one protocol data unit A wireless communication system having a transparent mode radio link control (RLC) layer. The transparent mode radio link control layer according to claim 1 , wherein the segment module transmits the number of protocol data units required by the number information of protocol data units transmitted from the lower layer to the lower layer. A wireless communication system. The wireless communication system having a transparent mode wireless link control layer according to claim 1 , wherein the size of the protocol data unit is determined from a transmission format of a transmission channel in which the protocol data unit is transmitted from the lower layer. . The wireless communication system having a transparent mode wireless link control layer according to claim 2 , wherein the protocol data unit is transmitted to the lower layer at predetermined transmission time intervals. Wherein the protocol data units divided from one of the service data unit is segmented, the radio having a radio link control layer of a transparent mode according to claim 4, characterized in that it is sent within one transmission time interval Communications system. The wireless communication system having a transparent mode wireless link control layer according to claim 1 , wherein the lower layer is a media access control (MAC) layer.   The wireless communication system having a transparent mode wireless link control layer according to claim 1, wherein the transmission data storage module stores and outputs data in units of the service data unit SDU. The wireless communication system having a transparent mode wireless link control layer according to claim 2 , wherein the size and number information of the protocol data unit is transmitted from the lower layer through MAC status notification information. A receiving buffer for storing at least one protocol data unit transmitted from the lower layer,
Was reconstituted in at least one of said service data unit said at least one protocol data unit provided from the reception buffer, and further comprising a reassembly module for transmission to the upper layer The radio | wireless communications system which has a radio link control layer of the transparent mode of Claim 1. Storing a service data unit transmitted from an upper layer via a transparent SAP (Tr-SAP) in a transmission data storage module;
Dividing the service data unit transmitted from the transmission data storage module into at least one protocol data unit based on the size information of the protocol data unit transmitted from the lower layer ;
And transmitting the at least one protocol data unit to a lower layer. A data processing method in a radio link control (RLC) layer in a transparent mode of a wireless communication system. The wireless communication system according to claim 10 , wherein the at least one protocol data unit is transmitted to the lower layer in a number required by the number information of protocol data units transmitted from the lower layer. Data processing method in radio link control layer in transparent mode. 11. The radio link control layer in a transparent mode of a wireless communication system according to claim 10 , wherein the size of the protocol data unit is determined from a transmission format of a transmission channel in which the protocol data unit is transmitted from the lower layer. Data processing method. The method according to claim 10 , wherein the protocol data unit is transmitted to the lower layer at a predetermined transmission time interval. Wherein the protocol data units divided from one of the service data unit is segmented, the radio link of the transparent mode of the wireless communication system according to claim 13, characterized in that transmitted within one transmission time interval Data processing method in the control hierarchy. 11. The data processing method in a radio link control layer in a transparent mode of a wireless communication system according to claim 10 , wherein the lower layer is a media access control (MAC) layer. The method of claim 10 , wherein the transmission data storage module stores and outputs data in units of the service data unit data (SDU). . The data processing in the radio link control layer of the transparent mode of the wireless communication system according to claim 11 , wherein the size and number information of the protocol data unit is transmitted from the lower layer through MAC status notification information. Method.

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